[Hackage] #714: cabal: Couldn't read cabal file ".\\HaTeX\\1.0.0\\HaTeX.cabal"

Hackage cvs-ghc at haskell.org
Fri Jul 30 10:33:11 EDT 2010

#714: cabal: Couldn't read cabal file ".\\HaTeX\\1.0.0\\HaTeX.cabal"
  Reporter:  guest               |        Owner:         
      Type:  defect              |       Status:  new    
  Priority:  normal              |    Milestone:         
 Component:  cabal-install tool  |      Version:
  Severity:  normal              |     Keywords:         
Difficulty:  normal              |   Ghcversion:  6.12.1 
  Platform:  Windows             |  

Comment(by duncan):

 Ah, found the problem.

 When we read a .cabal file from disk we use readUTF8File which ignores the
 BOM. We do not do the same when reading the .cabal entry from the index
 tarball in cabal-install.

 Really we should make `parsePackageDescription` take a `ByteString` and
 have it do all the decoding (utf, bom, line ending conversion) there in a
 single place.

 Ross: the temporary solution is to change the hackage-scripts upload
 script to read the .cabal file from disk using a modified readUTF8File
 that does not ignore the BOM:
 readUTF8File_LeavingBOMIntact :: FilePath -> IO String
 readUTF8File_LeavingBOMIntact f = fmap fromUTF8
                                 . hGetContents =<< openBinaryFile f
 We should also edit the two HaTex .cabal files in the current archive to
 strip off the BOM.

Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/714#comment:6>
Hackage <http://haskell.org/cabal/>
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